565253261 has 2 divisors, whose sum is σ = 565253262.
Its totient is φ = 565253260.
The previous prime is 565253257. The next prime is 565253263. The reversal of 565253261 is 162352565.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 291350761 + 273902500 = 17069^2 + 16550^2
It is a cyclic number.
It is not a de Polignac number, because 565253261 - 22 = 565253257 is a prime.
It is a super-2 number, since 2×5652532612 = 639022498142268242, which contains 22 as substring.
It is a Sophie Germain prime.
Together with 565253263, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (565253263) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282626630 + 282626631.
It is an arithmetic number, because the mean of its divisors is an integer number (282626631).
Almost surely, 2565253261 is an apocalyptic number.
It is an amenable number.
565253261 is a deficient number, since it is larger than the sum of its proper divisors (1).
565253261 is an equidigital number, since it uses as much as digits as its factorization.
565253261 is an evil number, because the sum of its binary digits is even.
The product of its digits is 54000, while the sum is 35.
The square root of 565253261 is about 23775.0554363181.
The cubic root of 565253261 is about 826.8264455690.
The spelling of 565253261 in words is "five hundred sixty-five million, two hundred fifty-three thousand, two hundred sixty-one".